uuid64. 64-bit unique identifier

^math:uid64[]
^math:uid64[options[3.4.6]

The method returns a random string of format:
   BA39BAB6340BE370

Note: in some OSes it results in pseudorandom string.

Options hash can be specified:
·$.lower(false/true) - to output the result in lower case, upper case by default.  

See
^math:uuid[].


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